The Zen-On brand appears on a full range of intermediate quality solid body electric guitars and basses, as well as thinline acoustic/electric hollowbody guitars and electric mandolins. By the late 1960s, the company began using the Morales trademark (See Morales). The Japanese manufacturer is unknown, and Zen-On was not heavily imported into the U.S. market. Source: Michael Wright, Vintage Guitar Magazine.
Instruments previously produced in Japan between circa 1946 and the late 1960s.

ZEN-ON Electric Guitars Models